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.454 Casull

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The .454 Casull is a cartridge, developed in 1957 by Dick Casull and Jack Fulmer. It was first announced in November 1959 by Guns and Ammo magazine. The basic design was a lengthened and structurally improved .45 Colt case. .45 Colt cartridges can fit into the .454's chambers, but not the other way because of the lengthened case. The new Casull round uses a small rifle primer rather than a pistol primer, because it develops extremely high chamber pressures of over 60,000 lbf/in² (410 MPa), and a rifle primer has a significantly stronger cup than a pistol primer. The .454 Casull can deliver a 250 grain (16 g) bullet with a muzzle velocity of over 1900 feet per second (580 m/s), developing more than 2000 ft·lbf (2,700 J) of energy. The round is primarily intended for hunting medium or large game and metallic silhouette shooting.

The recently introduced .460 Smith and Wesson cartridge has the same diameter as a .45 Colt or .454 Casull, and therefore revolvers chambered for it will also chamber the .454 Casull and .45 Colt. Until the introduction of the .460 Smith and Wesson Magnum, and the .500 Smith and Wesson Magnum, the .454 Casull was the most powerful commerically produced handgun round on the market.

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